I'm writing an android app that needs to copy a file to the "/system" partition at runtime. I've got the commands to run "su" and can successfully request SuperUser permissions and run commands as root. But I don't know how to make this app universal across multiple devices, because the mount command can differ depending on where the /system is actually mounted. Here's the command that's used most offen:
mount -o remount,rw -t yaffs2 /dev/block/mtdblock3 /system
But I know that mtdblock3 could be different on some devices (and for that matter, i guess so could yaffs2). So, my question is: Is there a universal command that will work on all phones? Or is there a way to find out at runtime what the correct parameters are?
我使用这个命令:
mount -o rw,remount /system
You can run the mount command without parameter in order to get partition information before constructing your mount command. Here is an example of the mount command without parameter outputed from my HTC Hero.
$ mount
mount
rootfs / rootfs ro 0 0
tmpfs /dev tmpfs rw,mode=755 0 0
devpts /dev/pts devpts rw,mode=600 0 0
proc /proc proc rw 0 0
sysfs /sys sysfs rw 0 0
tmpfs /sqlite_stmt_journals tmpfs rw,size=4096k 0 0
none /dev/cpuctl cgroup rw,cpu 0 0
/dev/block/mtdblock3 /system yaffs2 rw 0 0
/dev/block/mtdblock5 /data yaffs2 rw,nosuid,nodev 0 0
/dev/block/mtdblock4 /cache yaffs2 rw,nosuid,nodev 0 0
/dev/block//vold/179:1 /sdcard vfat rw,dirsync,nosuid,nodev,noexec,uid=1000,gid=
1015,fmask=0702,dmask=0702,allow_utime=0020,codepage=cp437,iocharset=iso8859-1,s
hortname=mixed,utf8,errors=remount-ro 0 0
Try
mount -o remount,rw /system
If no error message is printed, it works.
Or, you should do the following.
First, make sure the fs type.
mount
Issue this command to find it out.
Then
mount -o rw,remount -t yaffs2 /dev/block/mtdblock3 /system
Note that the fs(yaffs2) and device(/dev/block/mtdblock3) are depend on your system.
Instead of
mount -o rw,remount /system/
use
mount -o rw,remount /system
mind the '/' at the end of the command. you ask why this matters? /system/ is the directory under /system while /system is the volume name.
您也可以尝试 adb remount 命令将 /system 重新挂载为读写
adb remount
You don't need to pass both arguments when performing a remount. You can simply pass the mount point (here /system). And /system is universal amongst Android devices.
I had the same problem. So here is the real answer: Mount the system under /proc
. Here is my command:
mount -o rw,remount /proc /system
It works, and in fact is the only way I can overcome the Read-only System problem.
This is what works on my first generation Droid X with Android version 2.3.4. I suspect that this will be universal. Steps:
root system and install su.
Install busybox
Install a terminal program.
to mount system rw first su then
busybox mount -o rw,remount system
To remount ro
busybox mount -o ro,remount system
Note that there are no slashes on "system".
If you have rooted your phone, but so not have busybox, only stock toybox, here a one-liner to run as root :
mount -o rw,remount $( mount | sed '/ /system /!d' | cut -d " " -f 1 ) /system
toybox do not support the "-o remount,rw" option
if you have busybox, you can use it :
busybox mount -o remount,rw /system
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